2. diketahui barisan aritmatika: U6=50 dan U41= 155 tentukan suku ke-7 TOLONG YAAA BESOK DI KUMPULIN

U6 = 50 ----> a + 5b = 50
U41 = 155 -----> a + 40b = 155

a + 5b = 50
a + 40b = 155
-------------------- --
-35b = -105
b = -105/-35 = 3

b=3 ----> a + 5b = 50
a + 5.3 = 50
a + 15 = 50
a = 50 - 15 = 35

U7
= a + 6b
= 35 + 6.3
= 35 + 18
= 53